<!doctype HTML>
<div style="width: 100px; height: 100px; background: lightblue; will-change: transform"></div>
<div style="width: 100px; height: 100px; backface-visibility: hidden;">
  <div id=target style="width: 100px; height: 100px;
      background: green; position: relative; margin-top: -50px; box-shadow: 5px 5px black"></div>
</div>

